This SanDisk Ultra Plus 16GB microSDHC memory card features a Class 10 UHS-1 speed rating to ensure quality video recording performance, while the rugged construction protects your media from damage due to temperature, X-rays, shock and water.
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What to say? It's a memory card, it holds data. Works great in Fuji X100 and in Olympus OM-D E-M5 cameras. Have seen read speeds as high as 37Mbytes/sec so I'd say it lives up to its claims of speed.